Carbide lamp



C. W. SCHAFER CARBIDE LAMP Filed 'Aug. 24, 1936 Nov. 2; 1937.

awaia e7 NVENToR ATTORNEYs WITNESS Patented Nov. 2, 1937 UNITE STESPATENT OFFIE 1 Claim.

The invention relates to a lamp of the acetylene type which is adaptedto be used by miners but may be otherwise serviceable.

The primary object of the invention is the provision of a lamp of thischaracter, wherein a sponge body, preferably made from soft rubber sothat it will be porous, is placed about the water feed tube of such lampfor the purpose of preventing sudden flow of water, particularly whenthe lamp is in action on the head gear of a wearer with the lamp in anupright position and such wearer suddenly stoops over to bring itslightly below horizontal position which necessarily would cause theflooding of the burner tip and resultant extinguishing of the light.

Another object of the invention is the provision of a lamp of thischaracter, wherein the porous body or pad fitted within the same willfunction as a filter to avoid choking or stopping up of the burner tipand retarding the flooding of the said tip by water with the result thatthe flame will be constant when the lamp is lighted and at the same timethe corroding of the threads joining the carbide holder with the waterfont will be prevented and. in this manner maintaining the lamp in aworking condition.

A further object of the invention is the provision of a lamp of thischaracter, wherein the porous disk fitted within the same will serve toclean the gas and also maintain the burner tip free from particles ofcarbide and at the same time assure a more constant pressure at theburner tip resulting in the uniform flame.

A further object of the invention is the provi- 35 sion of a lamp ofthis character, which is simple in construction, thoroughly reliable andeflicient in its operation, self-cleaning, durable, and inexpensive tomanufacture.

With these and other objects in View, the invention consists in thefeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawing, which discloses the preferred embodiment of the invention andpointed out in the claim hereunto appended.

In the accompanying drawing:

Figure 1 is a vertical longitudinal sectional view through a lampconstructed in. accordance with the invention.

Figure 2 is a sectional view on the line 2-2 of Figure 1 looking in thedirection of the arrows.

Figure 3 is a side elevation of the porous pad for fitting within thelamp and removed therefrom.

Similar reference characters indicate corresponding parts throughout theseveral views in the drawing.

Referring to the drawing in detail, the lamp, which is of conventionalform, includes a carbide holder lo, a water font II and a burner l2, re-5 spectively. Leading from the font ll into the carbide holder is aWater feed tube l3 which is centrally located relative thereto and isequipped with a hand operated valve It for regulating the feed of waterfrom the font to said carbide 10 holder l0.

The bottom l5 of the font ll serves as a cover or top for the carbideholder Hi and opening through this bottom is the inner end of the burnerI 2, it having a burner tip I6 at its outer end. The 15 acetylene gasformed within the holder l0 passes into the burner l2 and is lighted atthe tip 16 as is usual. The feed of water from the font H to the carbideholder in is regulated and controlled by the valve M in the ordinarywell-known manner.

Surrounding the tube 13 beneath the bottom I5 of the font II is a spongerubber pad I! of disk form and is carried upon a solid rubber sleeve l8snugly embracing the tube l3. This sleeve l8 has its lower end extendedbeyond the pad I! and is of enlarged annular formation providing acircular rim or flange l9 having a sloping surface 20. The pad I! at itsunder face is convexed or downwardly tapered at 2| and such face forsubstantially one half of the diameter of said pad carries an imperviousfacing of solid rubber coating 22 which is located on the application ofthe pad l1 to the tube l3 and within the lamp is directed beneath theport 23 establishing communication between the carbide container It andthe burner l 2, this port 23 being in the bottom I5 of the font 1 I sothat acetylene gas formed within the container II] will percolatethrough the uncoated or surfaced area of the pad H and flnd its waythrough this pad into the burner 52. In this manner the gas is filteredso that when pressure is created within the container i 5] smallparticles of carbide or other foreign matter Will be prevented frompassing into the burner l2 and clogging or choking the tip it thereof.The pad I! also functions to maintaina constant flame at the tip l6 whenlighted in that the pressure within the container it for the carbidewill be uniform in the functioning of such pad.

The flange E9 on the sleeve l8 carrying the pad I? will avoid waterdeposits on the tube l3 Working upwardly thereof from within the carbideholder l0 and any accumulation of water on the pad I! at the under facethereof will have flow therefrom over the surface 20 of the flange IQfor dropping back into the carbide holder 10.

The pad I! when within the lamp will serve to seal the joint between thecontainer 10 and the font H to avoid corroding of the threadedconnections 24 therebetween and at the same time sealing the joint atthe said threaded connections 24 to avoid leakage of acetylene gas fromthe container 10 when the latter is fitted with the font II.

The pad I! is porous excepting at the coating or facing 22 while thesleeve I8 is non-porous and the latter frictionally holds the said padI! in place upon the water tube l3 when such sleeve is fitted thereon.

What is claimed is:

A filtering pad for a carbide lamp having a the body and having anenlarged annular formation providing a circular rim with a sloping upperface beneath said body, the body at its under face being downwardlytapered, and an impervious facing over substantially one-half of thediameter of the said downwardly tapered under A face of the body.

CHARLES W. SCHAFER.

